Abstract

The concentrations of As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se and Zn in the muscle, gills, liver and intestineof the wels catfish (Silurus glanis) from the Danube River were analyzed by inductively coupled plasma mass spectrometry(ICP-MS). The aim of the study was to determine whether in complex muscle/skin, gill filament/gill arch, proximal/distalliver and proximal/median/distal intestine samples, particular components differ in concentrations of the analyzed elements.Results indicated that there were no differences in the accumulation of different elements between the proximal and distalliver segments and between the proximal and median intestine sections. Conversely, elemental accumulation patterns inmuscle and skin differed significantly. Significant differences were also observed between the gill arch and filaments, as wellas between the distal and the two upper intestine sections. Findings indicated the importance of detailed reporting of tissuesampling, i.e. whether the skin was included in the muscle sample, as well as if the gill arch and filaments were analyzedtogether. Due to a potential bias that can be produced by different muscle/skin or gill arch/filament ratios included in thesample, we strongly recommend that they should not be analyzed together. Results of the present study might be of interestto the scientific community and stakeholders involved in aquatic ecosystem monitoring programs.